#  Copyright 2008-2015 Nokia Networks
#  Copyright 2016-     Robot Framework Foundation
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.

import warnings
from collections import OrderedDict
from typing import Any, cast, Mapping, Literal, Sequence, TypeVar, TYPE_CHECKING

from robot.utils import setter

from .body import Body, BodyItem, BodyItemParent, BaseBranches, BaseIterations
from .modelobject import DataDict
from .visitor import SuiteVisitor

if TYPE_CHECKING:
    from robot.model import Keyword, Message


IT = TypeVar('IT', bound='IfBranch|TryBranch')
FW = TypeVar('FW', bound='ForIteration|WhileIteration')


class Branches(BaseBranches['Keyword', 'For', 'While', 'Group', 'If', 'Try', 'Var',
                            'Return', 'Continue', 'Break', 'Message', 'Error', IT]):
    __slots__ = ()


class Iterations(BaseIterations['Keyword', 'For', 'While', 'Group', 'If', 'Try', 'Var',
                                'Return', 'Continue', 'Break', 'Message', 'Error', FW]):
    __slots__ = ()


class ForIteration(BodyItem):
    """Represents one FOR loop iteration."""
    type = BodyItem.ITERATION
    body_class = Body
    repr_args = ('assign',)
    __slots__ = ['assign', 'message', 'status', '_start_time', '_end_time',
                 '_elapsed_time']

    def __init__(self, assign: 'Mapping[str, str]|None' = None,
                 parent: BodyItemParent = None):
        self.assign = OrderedDict(assign or ())
        self.parent = parent
        self.body = ()

    @property
    def variables(self) -> 'Mapping[str, str]':    # TODO: Remove in RF 8.0.
        """Deprecated since Robot Framework 7.0. Use :attr:`assign` instead."""
        warnings.warn("'ForIteration.variables' is deprecated and will be removed in "
                      "Robot Framework 8.0. Use 'ForIteration.assign' instead.")
        return self.assign

    @setter
    def body(self, body: 'Sequence[BodyItem|DataDict]') -> Body:
        return self.body_class(self, body)

    def visit(self, visitor: SuiteVisitor):
        visitor.visit_for_iteration(self)

    @property
    def _log_name(self):
        return ', '.join(f'{name} = {value}' for name, value in self.assign.items())

    def to_dict(self) -> DataDict:
        return {
            'type': self.type,
            'assign': dict(self.assign),
            'body': self.body.to_dicts()
        }


@Body.register
class For(BodyItem):
    """Represents ``FOR`` loops."""
    type = BodyItem.FOR
    body_class = Body
    repr_args = ('assign', 'flavor', 'values', 'start', 'mode', 'fill')
    __slots__ = ['assign', 'flavor', 'values', 'start', 'mode', 'fill']

    def __init__(self, assign: Sequence[str] = (),
                 flavor: Literal['IN', 'IN RANGE', 'IN ENUMERATE', 'IN ZIP'] = 'IN',
                 values: Sequence[str] = (),
                 start: 'str|None' = None,
                 mode: 'str|None' = None,
                 fill: 'str|None' = None,
                 parent: BodyItemParent = None):
        self.assign = tuple(assign)
        self.flavor = flavor
        self.values = tuple(values)
        self.start = start
        self.mode = mode
        self.fill = fill
        self.parent = parent
        self.body = ()

    @property
    def variables(self) -> 'tuple[str, ...]':    # TODO: Remove in RF 8.0.
        """Deprecated since Robot Framework 7.0. Use :attr:`assign` instead."""
        warnings.warn("'For.variables' is deprecated and will be removed in "
                      "Robot Framework 8.0. Use 'For.assign' instead.")
        return self.assign

    @variables.setter
    def variables(self, assign: 'tuple[str, ...]'):
        warnings.warn("'For.variables' is deprecated and will be removed in "
                      "Robot Framework 8.0. Use 'For.assign' instead.")
        self.assign = assign

    @setter
    def body(self, body: 'Sequence[BodyItem|DataDict]') -> Body:
        return self.body_class(self, body)

    def visit(self, visitor: SuiteVisitor):
        visitor.visit_for(self)

    def to_dict(self) -> DataDict:
        data = {'type': self.type,
                'assign': self.assign,
                'flavor': self.flavor,
                'values': self.values}
        for name, value in [('start', self.start),
                            ('mode', self.mode),
                            ('fill', self.fill)]:
            if value is not None:
                data[name] = value
        data['body'] = self.body.to_dicts()
        return data

    def __str__(self):
        parts = ['FOR', *self.assign, self.flavor, *self.values]
        for name, value in [('start', self.start),
                            ('mode', self.mode),
                            ('fill', self.fill)]:
            if value is not None:
                parts.append(f'{name}={value}')
        return '    '.join(parts)

    def _include_in_repr(self, name: str, value: Any) -> bool:
        return value is not None or name in ('assign', 'flavor', 'values')


class WhileIteration(BodyItem):
    """Represents one WHILE loop iteration."""
    type = BodyItem.ITERATION
    body_class = Body
    __slots__ = ()

    def __init__(self, parent: BodyItemParent = None):
        self.parent = parent
        self.body = ()

    @setter
    def body(self, body: 'Sequence[BodyItem|DataDict]') -> Body:
        return self.body_class(self, body)

    def visit(self, visitor: SuiteVisitor):
        visitor.visit_while_iteration(self)

    def to_dict(self) -> DataDict:
        return {
            'type': self.type,
            'body': self.body.to_dicts()
        }


@Body.register
class While(BodyItem):
    """Represents ``WHILE`` loops."""
    type = BodyItem.WHILE
    body_class = Body
    repr_args = ('condition', 'limit', 'on_limit', 'on_limit_message')
    __slots__ = ['condition', 'limit', 'on_limit', 'on_limit_message']

    def __init__(self, condition: 'str|None' = None,
                 limit: 'str|None' = None,
                 on_limit: 'str|None' = None,
                 on_limit_message: 'str|None' = None,
                 parent: BodyItemParent = None):
        self.condition = condition
        self.on_limit = on_limit
        self.limit = limit
        self.on_limit_message = on_limit_message
        self.parent = parent
        self.body = ()

    @setter
    def body(self, body: 'Sequence[BodyItem|DataDict]') -> Body:
        return self.body_class(self, body)

    def visit(self, visitor: SuiteVisitor):
        visitor.visit_while(self)

    def _include_in_repr(self, name: str, value: Any) -> bool:
        return name == 'condition' or value is not None

    def to_dict(self) -> DataDict:
        data: DataDict = {'type': self.type}
        for name, value in [('condition', self.condition),
                            ('limit', self.limit),
                            ('on_limit', self.on_limit),
                            ('on_limit_message', self.on_limit_message)]:
            if value is not None:
                data[name] = value
        data['body'] = self.body.to_dicts()
        return data

    def __str__(self) -> str:
        parts = ['WHILE']
        if self.condition is not None:
            parts.append(self.condition)
        if self.limit is not None:
            parts.append(f'limit={self.limit}')
        if self.on_limit is not None:
            parts.append(f'on_limit={self.on_limit}')
        if self.on_limit_message is not None:
            parts.append(f'on_limit_message={self.on_limit_message}')
        return '    '.join(parts)


@Body.register
class Group(BodyItem):
    """Represents ``GROUP``."""
    type = BodyItem.GROUP
    body_class = Body
    repr_args = ('name',)
    __slots__ = ['name']

    def __init__(self, name: str = '',
                 parent: BodyItemParent = None):
        self.name = name
        self.parent = parent
        self.body = ()

    @setter
    def body(self, body: 'Sequence[BodyItem|DataDict]') -> Body:
        return self.body_class(self, body)

    def visit(self, visitor: SuiteVisitor):
        visitor.visit_group(self)

    def to_dict(self) -> DataDict:
        return {'type': self.type, 'name': self.name, 'body': self.body.to_dicts()}

    def __str__(self) -> str:
        parts = ['GROUP']
        if self.name:
            parts.append(self.name)
        return '    '.join(parts)


class IfBranch(BodyItem):
    """Represents individual ``IF``, ``ELSE IF`` or ``ELSE`` branch."""
    body_class = Body
    repr_args = ('type', 'condition')
    __slots__ = ['type', 'condition']

    def __init__(self, type: str = BodyItem.IF,
                 condition: 'str|None' = None,
                 parent: BodyItemParent = None):
        self.type = type
        self.condition = condition
        self.parent = parent
        self.body = ()

    @setter
    def body(self, body: 'Sequence[BodyItem|DataDict]') -> Body:
        return self.body_class(self, body)

    @property
    def id(self) -> str:
        """Branch id omits IF/ELSE root from the parent id part."""
        if not self.parent:
            return 'k1'
        if not self.parent.parent:
            return self._get_id(self.parent)
        return self._get_id(self.parent.parent)

    def visit(self, visitor: SuiteVisitor):
        visitor.visit_if_branch(self)

    def to_dict(self) -> DataDict:
        data = {'type': self.type}
        if self.condition:
            data['condition'] = self.condition
        data['body'] = self.body.to_dicts()
        return data

    def __str__(self) -> str:
        if self.type == self.IF:
            return f'IF    {self.condition}'
        if self.type == self.ELSE_IF:
            return f'ELSE IF    {self.condition}'
        return 'ELSE'


@Body.register
class If(BodyItem):
    """IF/ELSE structure root. Branches are stored in :attr:`body`."""
    type = BodyItem.IF_ELSE_ROOT
    branch_class = IfBranch
    branches_class = Branches[branch_class]
    __slots__ = []

    def __init__(self, parent: BodyItemParent = None):
        self.parent = parent
        self.body = ()

    @setter
    def body(self, branches: 'Sequence[BodyItem|DataDict]') -> branches_class:
        return self.branches_class(self.branch_class, self, branches)

    @property
    def id(self) -> None:
        """Root IF/ELSE id is always ``None``."""
        return None

    def visit(self, visitor: SuiteVisitor):
        visitor.visit_if(self)

    def to_dict(self) -> DataDict:
        return {'type': self.type,
                'body': self.body.to_dicts()}


class TryBranch(BodyItem):
    """Represents individual ``TRY``, ``EXCEPT``, ``ELSE`` or ``FINALLY`` branch."""
    body_class = Body
    repr_args = ('type', 'patterns', 'pattern_type', 'assign')
    __slots__ = ['type', 'patterns', 'pattern_type', 'assign']

    def __init__(self, type: str = BodyItem.TRY,
                 patterns: Sequence[str] = (),
                 pattern_type: 'str|None' = None,
                 assign: 'str|None' = None,
                 parent: BodyItemParent = None):
        if (patterns or pattern_type or assign) and type != BodyItem.EXCEPT:
            raise TypeError(f"'{type}' branches do not accept patterns or assignment.")
        self.type = type
        self.patterns = tuple(patterns)
        self.pattern_type = pattern_type
        self.assign = assign
        self.parent = parent
        self.body = ()

    @property
    def variable(self) -> 'str|None':    # TODO: Remove in RF 8.0.
        """Deprecated since Robot Framework 7.0. Use :attr:`assign` instead."""
        warnings.warn("'TryBranch.variable' is deprecated and will be removed in "
                      "Robot Framework 8.0. Use 'TryBranch.assign' instead.")
        return self.assign

    @variable.setter
    def variable(self, assign: 'str|None'):
        warnings.warn("'TryBranch.variable' is deprecated and will be removed in "
                      "Robot Framework 8.0. Use 'TryBranch.assign' instead.")
        self.assign = assign

    @setter
    def body(self, body: 'Sequence[BodyItem|DataDict]') -> Body:
        return self.body_class(self, body)

    @property
    def id(self) -> str:
        """Branch id omits TRY/EXCEPT root from the parent id part."""
        if not self.parent:
            return 'k1'
        if not self.parent.parent:
            return self._get_id(self.parent)
        return self._get_id(self.parent.parent)

    def visit(self, visitor: SuiteVisitor):
        visitor.visit_try_branch(self)

    def to_dict(self) -> DataDict:
        data: DataDict = {'type': self.type}
        if self.type == self.EXCEPT:
            data['patterns'] = self.patterns
            if self.pattern_type:
                data['pattern_type'] = self.pattern_type
            if self.assign:
                data['assign'] = self.assign
        data['body'] = self.body.to_dicts()
        return data

    def __str__(self) -> str:
        if self.type != BodyItem.EXCEPT:
            return self.type
        parts = ['EXCEPT', *self.patterns]
        if self.pattern_type:
            parts.append(f'type={self.pattern_type}')
        if self.assign:
            parts.extend(['AS', self.assign])
        return '    '.join(parts)

    def _include_in_repr(self, name: str, value: Any) -> bool:
        return bool(value)


@Body.register
class Try(BodyItem):
    """TRY/EXCEPT structure root. Branches are stored in :attr:`body`."""
    type = BodyItem.TRY_EXCEPT_ROOT
    branch_class = TryBranch
    branches_class = Branches[branch_class]
    __slots__ = []

    def __init__(self, parent: BodyItemParent = None):
        self.parent = parent
        self.body = ()

    @setter
    def body(self, branches: 'Sequence[TryBranch|DataDict]') -> branches_class:
        return self.branches_class(self.branch_class, self, branches)

    @property
    def try_branch(self) -> TryBranch:
        if self.body and self.body[0].type == BodyItem.TRY:
            return cast(TryBranch, self.body[0])
        raise TypeError("No 'TRY' branch or 'TRY' branch is not first.")

    @property
    def except_branches(self) -> 'list[TryBranch]':
        return [cast(TryBranch, branch) for branch in self.body
                if branch.type == BodyItem.EXCEPT]

    @property
    def else_branch(self) -> 'TryBranch|None':
        for branch in self.body:
            if branch.type == BodyItem.ELSE:
                return cast(TryBranch, branch)
        return None

    @property
    def finally_branch(self) -> 'TryBranch|None':
        if self.body and self.body[-1].type == BodyItem.FINALLY:
            return cast(TryBranch, self.body[-1])
        return None

    @property
    def id(self) -> None:
        """Root TRY/EXCEPT id is always ``None``."""
        return None

    def visit(self, visitor: SuiteVisitor):
        visitor.visit_try(self)

    def to_dict(self) -> DataDict:
        return {'type': self.type,
                'body': self.body.to_dicts()}


@Body.register
class Var(BodyItem):
    """Represents ``VAR``."""
    type = BodyItem.VAR
    repr_args = ('name', 'value', 'scope', 'separator')
    __slots__ = ['name', 'value', 'scope', 'separator']

    def __init__(self, name: str = '',
                 value: 'str|Sequence[str]' = (),
                 scope: 'str|None' = None,
                 separator: 'str|None' = None,
                 parent: BodyItemParent = None):
        self.name = name
        self.value = (value,) if isinstance(value, str) else tuple(value)
        self.scope = scope
        self.separator = separator
        self.parent = parent

    def visit(self, visitor: SuiteVisitor):
        visitor.visit_var(self)

    def to_dict(self) -> DataDict:
        data = {'type': self.type,
                'name': self.name,
                'value': self.value}
        if self.scope is not None:
            data['scope'] = self.scope
        if self.separator is not None:
            data['separator'] = self.separator
        return data

    def __str__(self):
        parts = ['VAR', self.name, *self.value]
        if self.separator is not None:
            parts.append(f'separator={self.separator}')
        if self.scope is not None:
            parts.append(f'scope={self.scope}')
        return '    '.join(parts)

    def _include_in_repr(self, name: str, value: Any) -> bool:
        return value is not None or name in ('name', 'value')


@Body.register
class Return(BodyItem):
    """Represents ``RETURN``."""
    type = BodyItem.RETURN
    repr_args = ('values',)
    __slots__ = ['values']

    def __init__(self, values: Sequence[str] = (),
                 parent: BodyItemParent = None):
        self.values = tuple(values)
        self.parent = parent

    def visit(self, visitor: SuiteVisitor):
        visitor.visit_return(self)

    def to_dict(self) -> DataDict:
        data = {'type': self.type}
        if self.values:
            data['values'] = self.values
        return data

    def __str__(self):
        return '    '.join(['RETURN', *self.values])

    def _include_in_repr(self, name: str, value: Any) -> bool:
        return bool(value)


@Body.register
class Continue(BodyItem):
    """Represents ``CONTINUE``."""
    type = BodyItem.CONTINUE
    __slots__ = []

    def __init__(self, parent: BodyItemParent = None):
        self.parent = parent

    def visit(self, visitor: SuiteVisitor):
        visitor.visit_continue(self)

    def to_dict(self) -> DataDict:
        return {'type': self.type}

    def __str__(self):
        return 'CONTINUE'


@Body.register
class Break(BodyItem):
    """Represents ``BREAK``."""
    type = BodyItem.BREAK
    __slots__ = []

    def __init__(self, parent: BodyItemParent = None):
        self.parent = parent

    def visit(self, visitor: SuiteVisitor):
        visitor.visit_break(self)

    def to_dict(self) -> DataDict:
        return {'type': self.type}

    def __str__(self):
        return 'BREAK'


@Body.register
class Error(BodyItem):
    """Represents syntax error in data.

    For example, an invalid setting like ``[Setpu]`` or ``END`` in wrong place.
    """
    type = BodyItem.ERROR
    repr_args = ('values',)
    __slots__ = ['values']

    def __init__(self, values: Sequence[str] = (),
                 parent: BodyItemParent = None):
        self.values = tuple(values)
        self.parent = parent

    def visit(self, visitor: SuiteVisitor):
        visitor.visit_error(self)

    def to_dict(self) -> DataDict:
        return {'type': self.type,
                'values': self.values}

    def __str__(self):
        return '    '.join(['ERROR', *self.values])
